i create raid 10 , i removed two arrays form md11 one by one  , after that i going to editing the contents those are mounted ( it will be not responding stage), after i try for remove arrays those are left it is  shows device or resource busy ( is not removed from memory).
i try to terminate process this is also not work, i absorve from 4 days resync will be 8.0% it can not modifying.
cat /proc/mdstat
Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [linear] [raid10] 
md11 : active raid10 sde1[3] sdj14
      286743936 blocks 64K chunks 2 near-copies [4/1] [___U] [1:2:3:0]
      [=...................]  resync =  8.0% (23210368/286743936) finish=289392.6min speed=15K/sec
mdadm -D /dev/md11
/dev/md11:
        Version : 00.90.03
  Creation Time : Sun Jan 16 16:20:01 2011
     Raid Level : raid10
     Array Size : 286743936 (273.46 GiB 293.63 GB)
    Device Size : 143371968 (136.73 GiB 146.81 GB)
   Raid Devices : 4
  Total Devices : 2
Preferred Minor : 11
    Persistence : Superblock is persistent
Update Time : Sun Jan 16 16:56:07 2011
      State : active, degraded, resyncing
Active Devices : 1
Working Devices : 1
 Failed Devices : 1
  Spare Devices : 0
     Layout : near=2, far=1
 Chunk Size : 64K
Rebuild Status : 8% complete
       UUID : 5e124ea4:79a01181:dc4110d3:a48576ea
     Events : 0.23
Number   Major   Minor   RaidDevice State
   0       0        0        0      removed
   1       0        0        1      removed
   4       8      145        2      faulty spare rebuilding   /dev/sdj1
   3       8       65        3      active sync   /dev/sde1
umount /dev/md11
umount: /dev/md11: not mounted
mdadm -S /dev/md11
mdadm: fail to stop array /dev/md11: Device or resource busy
lsof /dev/md11
COMMAND     PID USER   FD   TYPE DEVICE SIZE NODE NAME
mount      2128 root    3r   BLK   9,11      4058 /dev/md11
mount      5018 root    3r   BLK   9,11      4058 /dev/md11
mdadm     27605 root    3r   BLK   9,11      4058 /dev/md11
mount     30562 root    3r   BLK   9,11      4058 /dev/md11
badblocks 30591 root    3r   BLK   9,11      4058 /dev/md11
kill -9 2128
kill -9 5018
kill -9 27605
kill -9 30562
kill -3 30591
mdadm -S /dev/md11
mdadm: fail to stop array /dev/md11: Device or resource busy
lsof /dev/md11
COMMAND     PID USER   FD   TYPE DEVICE SIZE NODE NAME
mount      2128 root    3r   BLK   9,11      4058 /dev/md11
mount      5018 root    3r   BLK   9,11      4058 /dev/md11
mdadm     27605 root    3r   BLK   9,11      4058 /dev/md11
mount     30562 root    3r   BLK   9,11      4058 /dev/md11
badblocks 30591 root    3r   BLK   9,11      4058 /dev/md11
cat /proc/mdstat
Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [linear] [raid10] 
md11 : active raid10 sde1[3] sdj14
      286743936 blocks 64K chunks 2 near-copies [4/1] [___U] [1:2:3:0]
      [=...................]  resync =  8.0% (23210368/286743936) finish=289392.6min speed=15K/sec